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Old 23rd September 2004, 07:37 AM   #1
robin2d is offline robin2d  Bangladesh
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Question How many watts a usual car cassette player?

How many watt RMS/ PMPO , A cassette player usually come with a car? I have a Toyota sedan car and i got a cassette player with this car. I want to know its audio power ? (watt in PMPO/RMS)

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Old 23rd September 2004, 01:10 PM   #2
sss is offline sss  Israel
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real rating is approx 40W rms max into 4 ohm
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Old 23rd September 2004, 01:14 PM   #3
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rms.... for a stock one, probably about 10 into 4 ohms.... for an aftermarket CD player, generally speaking, about 20...
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Old 23rd September 2004, 02:05 PM   #4
sss is offline sss  Israel
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theres one chip i dont remember the part number that can pull out 40 W @4 ohms rms from single 13.8V supply
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Old 23rd September 2004, 09:32 PM   #5
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PMPO: This will be whatever number som marketing exec thought sounded good. Relating this number to actual power takes place only in some imaginary construct. This is a number that I will ignore in all cases.

I put my old (Circa 2001) Pioneer MOSFET deck on a scope, and measured what it actually put out. It was rated for 40WX4. At .1% THD (which is horrible) it was putting out about 9W RMS, into a real speaker. Into a dummy load, it could go to 11W. At distortion numbers which I can't see speakers surviving very long, it got into the 30W range. By this time what was coming out would have been barely recognisable as the program material.

I have yet to see a deck that can match my 30WX4 1994 Alpine V-12 MRV-F300. My current Alpine deck has never had the speaker leads connected to anything, so I couldn't even tell you if the internal amplifier works.
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Old 24th September 2004, 08:48 PM   #6
maylar is offline maylar  United States
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Quote:
Originally posted by sss
theres one chip i dont remember the part number that can pull out 40 W @4 ohms rms from single 13.8V supply
Not possible without boosting the supply voltage. Theoretical maximum is 13.8V pk-pk which is 4.9V rms, and about 6 watts rms with 4 ohms. With a bridge circuit, voltage doubles and power quadruples to about 24 watts. That's at some nasty distortion point, too.

The Alpine V units boost the internal supply to 17 volts I think.
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